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Characteristics of perfluoromethyl vinyl ether:A new eco-friendly alternative gas for SF_(6)

High Voltage 2024年第3期9卷 509-517页

作者： Song Xiao Yijiang Chen Mingjun Tang Shuangshuang Tian Haoran Xia Yifan Wang Ju Tang Yi Li Xiaoxing Zhang State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityHubeiChina Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System School of Electrical and Electronic EngineeringHubei University of TechnologyWuhanChina

The exploration of eco-friendly insulating gas to substitute the most potent greenhouse gas sulphur hexafluoride(SF6)has consistently garnered significant ***,the au-thors evaluated the feasibility of utilising perfluoromethyl vinyl ether(PMVE,C_(3)F_(6)O)as a new branch of eco-friendly insulating gas for the first *** primary dielectric and stability characteristics of PMVE regarding AC breakdown,partial discharge,dielectric recovery,and decomposition properties were revealed under various gas pressure and electrical field *** was found that PMVE demonstrated superior dielectric strength,with the AC breakdown and PD inception voltage(PDIV)1.10 and 1.14 times that of pure SF_(6).Furthermore,the dielectric strength of PMVE exhibits stability even after undergoing 100 cycles of AC breakdowns,and there is no observable formation of solid precipitation on the electrode *** discharge decomposition of PMVE mainly generates fluorocarbon(CF_(4),C_(2)F_(6),C_(3)F_(6),C_(3)F_(8),etc.)and ***,the exceptional insulation stabilityandno absence of solidprecipitation featuresendow PMVE tobe utilised as a new eco-friendly gas for SF_(6)-free gas-insulated equipment.

关键词： surface dielectric vinyl

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Fate of oxytetracycline mediated by iron redox in simulated river-groundwater interactions

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Journal of Earth Science 2025年

作者： Wenjie Pan Cui Gan Jiachun Yang Hui Liu Li Zhang Lifen Liu Lei Tong MOE Key Laboratory of Groundwater Quality and Health， School of Environmental Studies， China University of Geosciences Key Laboratory of Black Soil and Water Resources Research of Heilongjiang Province State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution， Ministry of Ecology and Environment， China University of Geosciences College of Earth Sciences Jilin University

River - groundwater （RW - GW） interaction creates numerous challenges related to water quality. A central concern to this interplay is the redox process-driven transformation of iron and its degradation of organic micropollutants， however， the fundamental mechanisms and variability under different interaction intensities remain unclear. This study aims to elucidate the bidirectional reaction dynamics between Fe（Ⅱ） and oxytetracycline （OTC） under diverse conditions of RW and GW contact， including varying oxygen contents and interaction ratios. Our investigation reveals that Fe（Ⅱ） efficiently degrades OTC through a distinctive cyclic redox process， affected by varying levels of Fe（Ⅱ） and dissolved oxygen. Meanwhile， OTC inhibited the conversion of Fe（Ⅱ） to lepidocrocite by primarily forming complexes. Mechanistic studies indicate that Fe（Ⅱ） complexes with OTC through the tricarbonyl amide group in its A ring， while Fe（Ⅲ） associates with the phenolic diketone moieties on the B and C rings of OTC. The results showed that Ca2+exerted a more pronounced impact on OTC elimination and Fe（Ⅱ） transformation than NO3-， with the inhibitory effect increasing proportionally to Ca2+concentration. In contrast， the impact of humic acid （HA） on OTC degradation was found to be concentration-dependent， lower concentrations of HA were conductive to OTC degradation， whereas higher concentrations inhibited it. Given the ubiquity of Fe（Ⅱ） and OTC in RW-GW interactions， this study provides a novel perspective on the environmental fate of Fe（Ⅱ） and tetracycline contaminants in redox-sensitive regions.

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Differences in distributions, assembly mechanisms, and putative interactions of AOB and NOB at a large spatial scale

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Frontiers of environmental Science & Engineering 2023年第10期17卷 55-64页

作者： Bing Zhang Chenxiang Sun Huimin Lin Wei Liu Wentao Qin Tan Chen Ting Yang Xianghua Wen College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing 100084China Institute of Plant Protection Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China

Ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) play crucial roles in removing nitrogen from sewage in wastewater treatment plants (WWTPs) to protect water resources. However, the differences in ecological properties and putative interactions of AOB and NOB in WWTPs at a large spatial scale remain unclear. Hence, 132 activated sludge (AS) samples collected from 11 cities across China were studied by utilizing 16S rRNA gene sequencing technology. Results indicated that Nitrosomonas and Nitrosospira accounted for similar ratios of the AOB community and might play nearly equal roles in ammonia oxidation in AS. However, Nitrospira greatly outnumbered other NOB genera, with proportions varying from 94.7% to 99.9% of the NOB community in all WWTPs. Similar compositions and, hence, a low distance–decay turnover rate of NOB (0.035) across China were observed. This scenario might have partly resulted from the high proportions of homogenizing dispersal (~13%). Additionally, drift presented dominant roles in AOB and NOB assembling mechanisms (85.2% and 81.6% for AOB and NOB, respectively). The partial Mantel test illustrated that sludge retention time and temperature were the primary environmental factors affecting AOB and NOB communities. Network results showed that NOB played a leading role in maintaining module structures and node connections in AS. Moreover, most links between NOB and other microorganisms were positive, indicating that NOB were involved in complex symbioses with bacteria in AS.

关键词： Activated sludge Spatial distributions Microbial assembly Co-occurrence patterns Nitrifying bacteria

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Iron-based biochar as efficient persulfate activation catalyst for emerging pollutants removal:A review

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Chinese Chemical Letters 2023年第11期34卷 74-81页

作者： Jinjie Lu Qinwei Lu Lu Di Yi Zhou Yanbo Zhou State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China School of Carbon Neutrality Future Technology East China University of Science and TechnologyShanghai 200237China

In recent years,biochar(BC)as a low-cost,easily available biomass product,is widely applied in sulfate radical-based advanced oxidation processes(SR-AOPs)for emerging pollutants ***,a state-of-art review of iron-based biochar catalysts is currently available in SR-AOPs application.A general summary of the development of biochar and the catalytic properties of biochar is ***,the synthetic strategies of different types of iron-based biochar catalysts are ***,the theoretical calculation to interpret the interaction between biochar and iron species is discussed to explore the activation *** the regeneration methods of biochar-based catalyst are *** unresolved challenges of the existent biochar-based SR-AOPs are pointed out,and the outlooks of future research directions are proposed.

关键词： Biochar Persulfate Emerging pollutants

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Variations in source-specific soil organic matter components across 32 forest sites in China

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Carbon Research 2024年第1期3卷 1-16页

作者： Sun, Guodong Wang, Mengke Zhang, Qiang Wang, Yinghui Yang, Yuanxi Xu, Shan Wang, Junjian State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Marine Sciences Sun Yat-Sen University Zhuhai519082 China Zhuhai519082 China

Forest soils store substantial amounts of carbon in various soil organic matter (SOM) components due to high plant litter inputs and active microbial turnover. However, the variations in plant- and microbial-derived SOM components in surface and subsurface forest soils across a wide geographic scale remain poorly understood. This study investigated the SOM components from aboveground and belowground plant inputs and fungal and bacterial necromass in surface (soil0–5 cm) and subsurface (soil5–10 cm) soils across 32 forest sites in China and analyzed their relationships with climate and edaphic factors. Compared to soil0–5 cm, soil5–10 cm exhibited lower soil organic carbon content and cutin biomarker concentration but higher concentrations of fungal necromass carbon and lignin phenols. Higher mean annual precipitation led to higher concentrations of cutin and suberin biomarkers in soil0–5 cm and soil5–10 cm, respectively. Higher soil organic carbon content was associated with lower plant-derived lignin biomarkers, higher lignin oxidation degrees, and increased microbial necromass-derived amino sugars across sites, highlighting the pivotal role of microbial necromass in SOM stabilization. Additionally, both fungal and bacterial necromass decreased with increasing mineral weathering across sites. These insights improve the understanding of environmental drivers of source-specific carbon storage in forest soils. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

关键词： Amino sugars

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An effective strategy for biodegradation of high concentration phenol in soil via biochar-immobilized Rhodococcus pyridinivorans B403

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environmental Science and Pollution Research 2024年第23期31卷 33752-33762页

作者： Peng, Fang Liu, Jiashu Ping, Jiapeng Dong, Yuji Xie, Liuan Zhou, Yishan Liao, Lipei Song, Huiting Hubei Key Laboratory of Regional Development and Environmental Response School of Resources and Environmental Science Hubei University Wuhan430062 China State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life Science Hubei University Wuhan430062 China Key Laboratory for Quality Control of Characteristic Fruits and Vegetables of Hubei Province College of Life Science and Technology Hubei Engineering University Xiaogan432000 China

High concentration of phenol residues in soil are harmful to human health and ecological safety. However, limited information is available on the in-situ bioremediation of phenol-contaminated soil using biochar as a carrier for bacteria. In this study, bamboo -derived biochar was screened as a carrier to assemble microorganism-immobilized composite with Rhodococcus pyridinivorans B403. Then, SEM used to observe the micromorphology of composite and its bioactivity was detected in solution and soil. Finally, we investigated the effects of free B403 and biochar-immobilized B403 (BCJ) on phenol biodegradation in two types of soils and different initial phenol concentrations. Findings showed that bacterial cells were intensively distributed in/onto the carriers, showing high survival. Immobilisation increased the phenol degradation rate of strain B403 by 1.45 times (37.7 mg/(L·h)). The phenol removed by BCJ in soil was 81% higher than free B403 on the first day. Moreover, the removal of BCJ remained above 51% even at phenol concentration of 1,500 mg/kg, while it was only 15% for free B403. Compared with the other treatment groups, BCJ showed the best phenol removal effect in both tested soils. Our results indicate that the biochar-B403 composite has great potential in the remediation of high phenol-contaminated soil. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Phenols

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Unveiling microplastic distribution and interactions in the benthic layer of the Yangtze River Estuary and East China Sea

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environmental Science and Ecotechnology 2024年第4期20卷 114-122页

作者： Xinyu Ge Feng Xu Bo Li Lili Liu Xiao Lu Lijuan Wang Yunxiao Zhang Jiangpeng Li Jiawei Li Yuanyuan Tang School of Environmental Science and Engineering College of EngineeringSouthern University of Science and TechnologyShenzhen518055China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resource and Environmental EngineeringEast China University of Science and TechnologyShanghai200237China School of Marine Science and Technology Zhejiang Ocean UniversityZhoushan316004China

Microplastics(MPs),recognized as an emerging global environmental concern,have been extensively detected worldwide,with specific attention directed towards the Yangtze River Estuary(YRE)and East China Sea(ECS)*** their critical research significance,there remains a knowledge gap concerning the distribution of MPs in the benthic layer within this area,particularly regarding interactions governing their *** we illuminate the distribution of MPs within the benthic layer and unravel the intricate interplay between bottom water and sediment in the YRE and *** find that MPs are notably more abundant in bottom water,ranging from 8 to 175 times higher than in surface *** MPs predominantly consist of polyester fibers,exhibit a size range between 0.5 and 5.0 mm,and display distinct ***-occurrence network analysis and Principal Coordinate Analysis confirm a robust correlation between MPs in bottom water and sediment,signifying the pivotal role of bottom water in mediating the distribution and transportation of MPs within the benthic ***,a positive correlation between MPs in sediment and bottom water turbidity underscores the impact of surface sediment resuspension and upwelling on MPs *** study clarifies the intricate interactions within the benthic layer and highlights the crucial role of bottom water as a mediator in the vertical distribution of MPs,advancing our understanding of the“source-to-sink”transport processes governing MPs within water-sediment systems.

关键词： Microplastics Bottom water Sediment Distribution Correlation analysis

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Screening legacy and emerging organic pollutants in the contaminated soil of Dhaka,Bangladesh

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Emerging Contaminants 2024年第3期10卷 343-353页

作者： Refayat Nigar Shizhen Zhao Xin Liu Huanfang Huang Lele Tian Yuwei Xiao Ahsan Habib Gan Zhang State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou510640China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou510640China Anti-Drug Technology Center of Guangdong Province and National Anti-Drug Laboratory Guangdong Regional Center Guangzhou510230China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou510530China Department of Chemistry University of DhakaDhaka1000Bangladesh University of Chinese Academy of Sciences Beijing100049China

The current understanding of the legacy and emerging organic pollutants in the soil of Bangladesh remains *** disposal practices,particularly in e-waste,landfills,and industrial operations,may lead to the pervasive presence of persistent organic pollutants(POPs)and polycyclic aromatic hydrocarbons(PAHs)in the *** study aimed to systematically investigate the concentrations,sources,and risk assessment of halogenated flame retardants(HFRs),polychlorinated biphenyls(PCBs),polychlorinated naphthalenes(PCNs),organochlorine pesticides(OCPs),chlorinated paraffins(CPs),and PAHs in the contaminated soil of Dhaka's dumpsites,e-waste,and industrial areas collected in *** total concentration of investigated pollutants averaged at 4790±4040 ng g^(-1)dw,with the following order:P44CPs(4110±4140 ng g^(-1)dw)>P16PAHs(422±491 ng g^(-1)dw)>P16HFRs(190±538 ng g^(-1)dw)>P209PCBs(43.5±73.5 ng g^(-1)dw)>P50PCNs(17.7±21.0 ng g^(-1)dw)>P27OCPs(9.41±9.61 ng g^(-1)dw).The e-waste site exhibited the highest total concentration of the target pollutants,reaching 12,700 ng g1 *** were the predominant contributors,accounting for averages of 81.8%,70.5%,and 68.5%to waste landfills,e-waste,and industrial sites,respectively.A comprehensive analysis of 209 PCB congeners revealed their primary origin from Aroclor PCBs,with minor contributions from unintentionally produced *** highest incremental lifetime carcinogenic risk(ILCR)occurred in e-waste sites,contributed by dioxin-like PCBs,with a maximum value of 5.9×10^(-5)for adults,exceeding the limit 1.0×10^(-6)set by the *** non-carcinogenic hazard quotients(HQs)were much lower,suggesting no significant risk from the investigated *** findings highlight the importance of proper waste management and regulated e-waste recycling to mitigate potential hazardous risks to the Bangladeshi population.

关键词： Persistent organic pollutants Polycyclic aromatic hydrocarbons Chlorinated paraffins Polychlorinated biphenyls Risk assessment Contaminated soil Bangladesh

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Reactive species regulation by interlayered Na^(+)/H^(+)of titanate nanotubes decorated Co(OH)_(2)hollow microsphere for peroxymonosulfate activation and gatifloxacin degradation

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Chinese Chemical Letters 2023年第12期34卷 263-268页

作者： Bin Zhou Long Chen Fan Li Weiliang Sun Zhicheng Pan Yumei Peng Lian Qiu Wen Liu The Key Laboratory of Water and Sediment Sciences Ministry of EducationCollege of Environmental Sciences and EngineeringPeking UniversityBejing 100871China National Engineering Laboratory of Farmland Soil Pollution Control and Remediation Technology Yonker Environmental Protection Co.Ltd.Changsha 410300China State Environmental Protection Key Laboratory of All Materials Flux in Rivers College of Environmental Science and EngineeringPeking UniversityBeijing 100871China Department of Civil and Environmental Engineering Louisiana State UniversityBaton Rouge 70803LAUnited States Laboratory of Wastewater Treatment Technology in Sichuan Province Haitian Water GroupChengdu 611230China

Emerging organic pollutants(EoPs)in water are of great concern due to their high environmental risk,so urgent technologies are needed for effective removal of those ***,a heterogeneous advanced oxidation process(AoP)of peroxymonosulfate(PMS)activation by functional material was developed for degradation of a typical antibiotic,gatifloxacin(GAT).The reactive species including sulfate radical(SO^(4)^(·-))and singlet oxygen(^(1)O_(2))in this AOP were regulated by interlayered ions(Na^(+)/H^(+))of titanate nanotubes that supported on Co(OH)_(2)hollow *** the Na-type(NaTi-CoHS)and H-type(HTi-CoHS)materials achieved efficient PMS activation for GAT degradation,and HTi-CoHS even exhibited a relatively high degradation efficiency of 96.6%within 5 ***(OH)_(2)was considered the key component for generation of SO_(4)^(·-)after PMS activation,while hydrogen titanate nanotubes(H-TNTs)promoted the transformation of peroxysulfate radical(SO_(5)^(·-))to ^(1)O_(2) by hydrogen bond ***,when the interlayer ion of TNTs transformed from Na^(+) to H^(+),more ^(1)O_(2) was produced for organic pollutant degradation.H-TNTs with lower symmetry preferred to adsorb PMS molecules to achieve interlayer electron transport through hydrogen bonding,rather than electrostatic interaction of Na^(+) for *** addition,the degradation pathway of GAT mainly proceeded by the cleavage of C-N bond at the 8 N site of the piperazine ring,which was confirmed by condensed Fukui index and mass spectrographic *** work gives new sights into the regulation of reactive species in AoPs by the composition of material and promotes the understanding of pollutant degradation mechanisms in water treatment process.

关键词： Heterogeneous catalysis Peroxymonosulfate activation Sulfate radical Singlet oxygen Antibiotic

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Optical and molecular insights into dissolved organic matter release in soils induced by downward migration of biochar colloids

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Carbon Research 2024年第1期3卷 1-13页

作者： Zhao, Kang Shang, Jianying College of Land Science and Technology China Agricultural University Key Laboratory of Arable Land Conservation in North China Ministry of Agriculture and Rural Affairs Beijing100193 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China

The frequent wildfires and extensive biochar application accumulate biochar colloids in soils. The transport of biochar colloids may influence the release of soil dissolved organic matter (DOM) due to their high mobility and active surface, posing a detrimental impact on carbon cycle, pollutants behaviors, and water quality. Here, we examined the effect of pristine and aged biochar colloids on soil DOM release in three types of soils (black soil, fluvisol, and paddy soil) through adsorption and column experiments combined with fluorescence excitation/emission matrix spectroscopy (EEM) and fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Adsorption experiment showed that biochar exhibited little effect on soil DOM release, while transport experiment indicated that the downward movement of both pristine and aged biochar colloids significantly enhanced the release of soil DOM, especially black soil and fluvisol. EEM spectra indicated that a humic acid-like substance with large molecular weights was the primary DOM that enhanced release from black soil (10.9–12.0% enhancement) and fluvisol (6–8% enhancement) during biochar colloid transport. Condensed aromatic-like (22.8% and 19.4%) and tannin-like (18.4% and 18.9%) compounds are the primary molecules correlated to the enhanced release of humic acid-like substances. Although chemical aging resulted in a more negative surface of aged biochar colloids and slightly enhanced biochar colloid transport (up to 7.0%), it showed no distinct effect on the release of soil DOM. This study indicates that biochar colloids may cause an increase in DOM release when irrigation and rainfall occur, and more attention should be paid to the environmental impacts of biochar colloids from intensive biochar application and wildfires. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

关键词： Fourier transform infrared spectroscopy

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